Dubbo、ZooKeeper、SpringMVC整合(登录案例)

事先准备:

1:将zk集群安装到linux系统上并启动,我这里是安装了三台,当然你也可以使用linxu或者windows的单机版,windows单机版的使用和配置都比较简单

2:(此步可以不用)将dubbo-admin安装到linxu上的tomcat中,用于查看生产者和消费者的使用情况,就是dubbo的监视中心

3:在父工程中引入依赖,父工程中导入依赖之后,他的子工程(module)就可以不用导入依赖了

  <dependencies>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

      <!--日志-->
      <dependency>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
          <version>1.2.17</version>
      </dependency>

      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.32</version>
      </dependency>

      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-jdbc</artifactId>
          <version>4.2.0.RELEASE</version>
      </dependency>

      <dependency>
      <groupId>com.github.sgroschupf</groupId>
      <artifactId>zkclient</artifactId>
      <version>0.1</version>
    </dependency>
    <dependency>
      <groupId>com.101tec</groupId>
      <artifactId>zkclient</artifactId>
      <version>0.10</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
      <version>2.5.3</version>
      <exclusions>
        <exclusion>
          <groupId>org.springframework</groupId>
          <artifactId>spring</artifactId>
        </exclusion>
      </exclusions>
    </dependency>


    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.2.0.RELEASE</version>
    </dependency>

    <!--MyBatis和Spring的整合包 由MyBatis提供-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>
    <!--MyBatis的核心jar文件-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.1</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
    </dependency>
  </dependencies>

第一步:创建Service工程

这个工程中主要放的就是生产者和消费者共用的实体类(Entity)和Service接口,生产者和消费者若要使用实体类或者接口的时候,就需要引用Service工程的依赖

        <dependency>
            <groupId>com.yjc</groupId>
            <artifactId>Service</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>

注意:dubbo环境中的实体类,由于要进行网络传输,必须要实现Serializable

第二步:创建Producers(生产者)

生产者的主要作用就是为消费者提供接口的实现类,dao层和接口的实现类和之前并没有什么多大的区别,只是接口的实现类实现的接口是之前创建的Service中的接口

Dao层接口,这里为了简便直接使用的是注解实现的方式,省略leMapper.xml

package com.yjc.dao;
import com.yjc.entity.User;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

@Repository
public interface Login {

    @Select("SELECT * FROM myuser  WHERE username=#{userName}")
    User checkLogin(String userName);
}

接口的实现类

package com.yjc.impl;

import com.yjc.dao.Login;
import com.yjc.entity.User;
import com.yjc.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service("iUserService")
public class IUserServiceImpl implements IUserService {

    @Autowired
    private Login login;

    @Override
    public User login(String userName, String password) {
        User user = login.checkLogin(userName);
        if (user!=null){
            if (user.getPassword().equals(password)) {
                return  user;
            }
        }
        return null;
    }
}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc"
        xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
        http://code.alibabatech.com/schema/dubbo
        http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--    导入数据库连接文件-->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="ignoreUnresolvablePlaceholders" value="true" />
        <property name="location" value="classpath:jdbc.properties"/>
    </bean>
    <!--配置数据源-->
    <bean  id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="username" value="${jdbc.user}"/>
    </bean>

    <!--配置MyBatis的核心对象SqlSessionFactoryBean-->
    <bean id="SessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--创建包扫描器（借助dao接口实现动态代理）-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer           ">
        <property name="basePackage" value="com.yjc.dao"/>
    </bean>
    <context:component-scan base-package="com.yjc"/>
    <context:annotation-config/>
    <mvc:annotation-driven/>
    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="app-provider"/>

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="192.168.118.3:2181,192.168.118.4:2181,192.168.118.5:2181"   protocol="zookeeper" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明需要暴露的服务接口 -->
    <dubbo:service interface="com.yjc.service.IUserService" ref="iUserService" />
</beans>

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mydata
jdbc.user=root
jdbc.password=123

启动项目.将服务注册到注册中心上去,当然你也可以将项目部署到tomcat上

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class RunProducers {
    public static void main(String[] args) throws IOException {
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
        System.out.println("服务已经注册到服务中心当中");
        System.in.read();
    }
}

第三步:创建Consumer(消费者)工程

consumer项目的基本上会是一个web项目,使用controller和页面进行交互,所有说消费者里就只有Controller和页面

 FirstController控制器

package com.yjc.controller;

import com.yjc.entity.User;
import com.yjc.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.annotation.Resource;

@Controller
@RequestMapping("/first")
public class FirstController {

    @RequestMapping("/getlogin")
    public  String  login(){
       return  "login";

    }

    @Autowired
    private IUserService  iUserService;
    @RequestMapping("/checkLogin")
    public  String checkLogin(User user){
        System.out.println(user.getPassword()+"----------"+user.getUserName());
        User login = iUserService.login(user.getUserName(), user.getPassword());
        if (login!=null){
            return "welcome";
        }
        return "login";
    }

}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
        http://code.alibabatech.com/schema/dubbo
        http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.yjc"/>
    <mvc:annotation-driven/>
    <context:annotation-config/>
    <!-- 配置视图解析器,设置前缀和后缀，自动拼接 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/jsp/" />
        <!-- 后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>

    <mvc:default-servlet-handler/>
    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="consumer"/>

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="192.168.118.3:2181,192.168.118.4:2181,192.168.118.5:2181"   protocol="zookeeper" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->
    <dubbo:reference id="iUserService" interface="com.yjc.service.IUserService" />

</beans>

Web.xml,用于加载xml文件,以及其他配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

  <!--Spring和MyBatis整合的核心配置-->
 <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!--配置SpringMVC的核心控制器DispatcherServlet-->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath*:applicationContext.xml</param-value>
         </init-param>
  </servlet>


    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>


    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <!--设置映射路径，/代表所有的请求都会被核心控制器映射到对应的Controller中-->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--编码过滤器-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!--初始化参数-->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>